<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>页面边距的使用</title>
    <style>
        body{
            background-color: yellowgreen;
            margin-left: 20%;
            margin-right: 20%;
            border: 2px dotted red;
            padding: 10px 10px 10px 10px;
            font-family: sans-serif;
        }
    </style>
</head>
<body>
    <h1>我的Github：Github.com/Roohom</h1>
    <h2>这是我的测试页面边距的案例</h2>
    <p>保持每天学习，好过这一生。</p>

</body>
</html>